Your constitution score increases by 2. 

Your body grows stronger with every level. Your Strength increases by 1 per level and you Strength ability score maximum increases by 1 per level beginning at the 13th level.

Your body ages as normal before you turned, and once you become a gargoyle you stop aging.

Thanks to your transformation, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

Your body is made of a hardened stone, which determines your armor class, your armor class equals 16 + your proficiency bonus; disadvantage on Dexterity (Stealth) checks. You gain no benefit from wearing armor, but if you are using a shield, you apply its bonus as normal.

Gargoyles can be both evil and good, and many tend to incline toward a lawful alignment. 

Most Gargoyles stand between 5 and 6 1/2 feet tall. Your body is made of solid stone, you weigh between 800-1500 pounds. Your size is medium. 

Your hands have extended sharpened claws, your feet are taloned, and you might even have a bladed, spiked or clubbed tail. You may choose to use any of these tools in place of an Unarmed Attack, if you hit with your claws or talons you deal slashing damage equal to 1d4 + your Strength modifier. Your tail will deal the same amount of damage, the type of damage depends on your tail.

When you take a long rest, you must spend at least six hours in an inactive, motionless state, rather than sleeping. In this state, you appear inert, but it doesn’t render you unconscious, and you can see and hear as normal.

You have large powerful wings which you can use to fly, your hands and feet are made of powerful claws and talons allowing you to quickly climb surfaces not made of metal.

Your stone body has remarkable fortitude, represented by the following benefits.

• You have advantage on saving throws against being poisoned, and you have resistance to poison damage.
• You are immune to disease.
• You don’t need to eat, drink, or breathe.
• You don’t need to sleep and don’t suffer the effects of exhaustion due to lack of rest, and magic can’t put you to sleep.

You can speak, read, and write Common.